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https://issues.apache.org/jira/browse/LUCENE-5761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14180479#comment-14180479
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Per Steffensen commented on LUCENE-5761:
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What is the alternative for those of us that have disk-doc-values in order to
be able to sort/facet on certain fields?
If we do not doc-value those fields the FieldCache will be used when
sorting/faceting, which will make us go OOM - we have so much data that we will
never be able to buy enough RAM to be able to hold all value of certain
field(s) in memory (what the FieldCache does AFAIK). We have seen
disk-doc-value as our only option, it actually works, and we can live with it
being "slow"
> Remove DiskDocValuesFormat
> --------------------------
>
> Key: LUCENE-5761
> URL: https://issues.apache.org/jira/browse/LUCENE-5761
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: 4.9, Trunk
>
> Attachments: LUCENE-5761.patch
>
>
> I see users using this, i think they are unaware of the horrible tradeoffs it
> makes.
> We don't e.g. have codecs that have the term dictionary entirely on disk or
> other stupid things in lucene, so we shouldnt be stupid here either.
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